================
@@ -62,6 +62,107 @@ static RegisterRegAlloc fastRegAlloc("fast", "fast register
allocator",
namespace {
+/// Assign ascending index for instructions in machine basic block. The index
+/// can be used to determine dominance between instructions in same MBB.
+class InstrPosIndexes {
+public:
+ void init(const MachineBasicBlock &MBB) {
+ CurMBB = &MBB;
+ Instr2PosIndex.clear();
+ uint64_t LastIndex = 0;
+ for (const MachineInstr &MI : MBB) {
+ LastIndex += InstrDist;
+ Instr2PosIndex[&MI] = LastIndex;
+ }
----------------
nikic wrote:
Can we do this lazily, on first query?
It looks like dominates() is actually only used in very rare situations (where
a block branches back to itself), so populating this map is unnecessary for
most blocks.
https://github.com/llvm/llvm-project/pull/72250
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